Apparatus for burning finely-divided fuel



Jan. 8, 1929. 1,698,555

J. MOLZ APPARATUS FOR BURNING FINELY DIVIDED FUEL Filed A ril 14, 1923 2 Sheets-Sheet 1 Fig. l.

INVENTO V WWW ATTORNEYS Jan. 8, 1929.

J. MOLZ APPARATUS FOR BURNING FINELY DIVIDED FUEL 2 Sheets-Sheet 2 Filed April .14, 1923 INVENTOR -%O-;Z. IBY A4 wg ATTOR N EY Patented Jan. 8, 1929.

UNITED STATES PATENT, 1 OFFICE.

JOSEPH MOLZgOF OBERHAUSEN, GERMANY, ASSIGNOR TO THE .BAIBGOCK & WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY. I

APPARATUS non BURNING FINELY-DIVI-DED FUEL.

Application filed April 14, 1923, Serial No. 631,958, and in Germany June 24, 1922.

The present invention relates to improvements in apparatus for burning finely divided fuel, such as powdered coal, sprayedoil or the like, and will be best understood from the following description and the anneired drawings, in which Fig. 1 is an illustrative form of apparatus as the invention will be applied to the combustion of powdered fuel; Fig. 2 is a section of Fig. 1 on the hue rt -a; Fig. 3 is a view similar to Fig. 1, showing a modification, and Fig. 4 is a view slmilar to Fig. 1, showing still another modification. Like reference characters indicate like parts in the several views.

Referring to the illustrative embodiment as shown in the drawings, C is a combustion chamber having a conical extension2 over it, this extension 2 being formed with the usual refractory walls held in a'casing 3. At the upper and smaller end of the conical egrtension or chamber 2 is an opening 4 1n which there is suspended a spreading cone 5 and a pipe 6 through which the powdered fuel passes to the opening 4 around the spreader 5.

Below the opening 4 is a pair of air inlets 7 opening at 8 into the conical chamber 2, the openings preferably being formed as shown best in Fig. 2, with one of the walls 8 thereof substantially tangent to the conical wall of the chamber 2 and the other wall 8" substantially radial to the conical chamber. The two' openings 8, 8 are disposed symmetrically and on opposite sides of the conical chamber. Preferably the opening 8 is also given a slightly downward direction, as shown in Fig. 1.

In using the device the powdered fuel is projected downward and, by reason of the presence of the spreader, tends to pass along the conical walls of the chamber 2. Air flows through the two openings 8, 8 and, by reason of its direction, it is given a whirl within the chamber 2, so as to thoroughly mix with the fuel and also tend to support it, so that the fuel is held in suspension, as it were, in the conical chamber 2 for a longer period than would be the case if the air through the openings 8 were not directed as shown. By reason of this suspension, the fuel is thoroughly dried and gasified before passing into the combustion chamber C. Consequently the combustion is more thorough and rapid than would be the case if the fuel were projected directly into the combu'stionchambcr without being retarded;

and, by reason of the direction of the flow,

of the fuel, its entrance into the combustion chamber would be retarded, though obviously not effectually asin the arrangement shown in Fig. 1.

I11 the arrangement shoWn in Fig. '4, the opening 4 is provided with a tube 4 through which air is supplied, the air passing out of the openings 4- above the enlargement 5", the fuel being supplied as before through the pipe 6 into the opening 4. In addition, air may also be supplied through the ducts 11 in the walls of the chamber 2, this air passing through openings 12 below the fuel entrance.

In this arrangement, the incoming fuel is affected by the currents of air through the openings 4 which have a slightly upward direction as well as a lateral direction, so that the velocity of the fuel is retarded, and this retardation is further aflfected by the flow of air through the openings 12, if the ducts 11 and the openings 12 are used.

It will be understood that the arrangements illustrated are merely typical and the embodiment of the invention may be widely varied. It will also be understood that while the invention has been described in connection with powdered fuel, many of its features may be used in connection with atomized oil or the like, in which case, the

fuel will be supplied through the usual sprayer nozzles common to the combustion of this character of fuel. I claim:

1. In apparatus for burning finely dividedfuel, a chamber having a generally conical space at its upper part, means for projecting a stream of'fuel in the shape of a hollow cone downward into said conical space, and means to project air horizontally and tangentially to the walls of the conical space.

2. In apparatus for burning finely divided fue, a chamber having a generally conical space at its up er part, means for projecting a stream of fuel in the shape of a hollow cone downward into said conical In this case, the air space and along the walls thereof, and means to project air into said conical space beneath the point of entrance of the fuel and in a direction having a component opposite to the direction of travel of said stream of fuel.

3. In a )paratus for burning finely divided fuei, a chamber having a generally conical space at its up or part, means for projecting a st eam 0 fuel in the shape of a hollow cone downward into said conical space and along the walls thereof, and means to project air horizontally and tangentially to the walls of the conical space.

4. In a paratus for burning finely divided fuei a chamber having a generally conical space at its upper part, means for projecting a stream of fuel downward'into said conical space, an air duct having a generally tangential entrance in the walls of said conical space below the fuel entrance, said entrance having an outwardly flaring mouth.

5. In apparatus for burning finely divided fuel, a chamber having a generally conical space at its upper part, means for project ing a stream of fuel downward and outward into said conical space and a pair of air ducts each having an entrance in thewalls of said conical space below the fuel entrance, said entrances being symmetrically disposed on opposite sides of the conical space and each having an outwardly flaring mouth directed slightly opposing the direction of travel of being symmetrically disposed on opposite sides of the conical space, the lateral walls of said entrances being respectively along lines substantially tangential and radial with respect to said conical. space.

7. In apparatus. for burning finely divided fuel, a chamber having. a generally conical space at its upper part, means for projecting a stream of fuel in the shape of a hollow cone downward into said conical space and along the walls thereof, and

means to project air into said conical space beneath the point of entrance of the fuel in a direction to retard the travel of the fuel.

JOSEPH MOLZ. 

